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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/gpu/gpu_backing_store_glx.h"
#include <GL/glew.h>
#include "base/scoped_ptr.h"
#include "chrome/common/gpu_messages.h"
#include "chrome/common/transport_dib.h"
#include "chrome/gpu/gpu_backing_store_glx_context.h"
#include "chrome/gpu/gpu_thread.h"
#include "chrome/gpu/gpu_view_x.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/skia/include/core/SkBitmap.h"
GpuBackingStoreGLX::GpuBackingStoreGLX(GpuViewX* view,
GpuThread* gpu_thread,
int32 routing_id,
const gfx::Size& size)
: view_(view),
gpu_thread_(gpu_thread),
routing_id_(routing_id),
size_(size),
texture_id_(0) {
gpu_thread_->AddRoute(routing_id_, this);
view_->BindContext(); // Must do this before issuing OpenGl.
glGenTextures(1, &texture_id_);
glBindTexture(GL_TEXTURE_2D, texture_id_);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
DCHECK(glGetError() == GL_NO_ERROR);
}
GpuBackingStoreGLX::~GpuBackingStoreGLX() {
if (texture_id_)
glDeleteTextures(1, &texture_id_);
gpu_thread_->RemoveRoute(routing_id_);
}
void GpuBackingStoreGLX::OnMessageReceived(const IPC::Message& msg) {
IPC_BEGIN_MESSAGE_MAP(GpuBackingStoreGLX, msg)
IPC_MESSAGE_HANDLER(GpuMsg_PaintToBackingStore, OnPaintToBackingStore)
IPC_MESSAGE_HANDLER(GpuMsg_ScrollBackingStore, OnScrollBackingStore)
IPC_END_MESSAGE_MAP_EX()
}
void GpuBackingStoreGLX::OnChannelConnected(int32 peer_pid) {
}
void GpuBackingStoreGLX::OnChannelError() {
// FIXME(brettw) does this mean we aren't getting any more messages and we
// should delete outselves?
NOTIMPLEMENTED();
}
void GpuBackingStoreGLX::OnPaintToBackingStore(
base::ProcessId source_process_id,
TransportDIB::Id id,
const gfx::Rect& bitmap_rect,
const std::vector<gfx::Rect>& copy_rects) {
TransportDIB* dib = TransportDIB::Map(id);
view_->BindContext();
scoped_ptr<skia::PlatformCanvas> canvas(
dib->GetPlatformCanvas(bitmap_rect.width(), bitmap_rect.height()));
const SkBitmap& transport_bitmap =
canvas->getTopPlatformDevice().accessBitmap(false);
for (size_t i = 0; i < copy_rects.size(); i++)
PaintOneRectToBackingStore(transport_bitmap, bitmap_rect, copy_rects[i]);
gpu_thread_->Send(new GpuHostMsg_PaintToBackingStore_ACK(routing_id_));
view_->Repaint();
}
void GpuBackingStoreGLX::OnScrollBackingStore(int dx, int dy,
const gfx::Rect& clip_rect,
const gfx::Size& view_size) {
}
void GpuBackingStoreGLX::PaintOneRectToBackingStore(
const SkBitmap& transport_bitmap,
const gfx::Rect& bitmap_rect,
const gfx::Rect& copy_rect) {
// Make a bitmap referring to the correct subset of the input bitmap.
SkBitmap copy_bitmap;
if (copy_rect.x() == 0 &&
copy_rect.y() == 0 &&
copy_rect.width() == bitmap_rect.width() &&
copy_rect.height() == bitmap_rect.height()) {
// The subregion we're being asked to copy is the full bitmap. We don't
// have to do any extra work to make the bitmap, we can just refer to the
// original data (bitmap assignments are just refs to the original).
copy_bitmap = transport_bitmap;
} else {
// Make a rect referring to the subset into the original (copy_rect and
// bitmap_rect are both in global coords) and make a copy of that data to
// give to OpenGL later.
//
// TODO(brettw) on desktop GL (not ES) we can do a trick here using
// GL_UNPACK_ROW_WIDTH, GL_UNPACK_SKIP_PIXELS and GL_UNPACK_SKIP_ROWS to
// avoid this copy.
//
// On ES, it may be better to actually call subimage for each row of
// the updated bitmap to avoid the copy. We will have to benchmark that
// approach against making the copy here to see if it performs better on
// the systems we're targeting.
SkIRect subset;
subset.fLeft = copy_rect.x() - bitmap_rect.x();
subset.fTop = copy_rect.y() - bitmap_rect.y();
subset.fRight = subset.fLeft + copy_rect.width();
subset.fBottom = subset.fTop + copy_rect.height();
SkIRect sk_copy_rect = { copy_rect.x() - bitmap_rect.x(),
copy_rect.y() - bitmap_rect.y(),
copy_rect.right(), copy_rect.bottom() };
// extractSubset will not acutually make a copy, and Skia will refer to the
// original data which is not what we want, since rows won't be contiguous.
// However, since this is very cheap, we can do it and *then* make a copy.
SkBitmap non_copied_subset;
transport_bitmap.extractSubset(&non_copied_subset, sk_copy_rect);
non_copied_subset.copyTo(©_bitmap, SkBitmap::kARGB_8888_Config);
CHECK(!copy_bitmap.isNull());
}
glBindTexture(GL_TEXTURE_2D, texture_id_);
SkAutoLockPixels lock(copy_bitmap);
if (copy_rect.size() == size_ && copy_rect.size() != texture_size_) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, copy_rect.width(),
copy_rect.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE,
copy_bitmap.getAddr32(0, 0));
texture_size_ = copy_rect.size();
DCHECK(glGetError() == GL_NO_ERROR);
} else {
/* Debugging code for why the below call may fail.
int existing_width = 0, existing_height = 0;
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH,
&existing_width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT,
&existing_height);
*/
glTexSubImage2D(GL_TEXTURE_2D, 0, copy_rect.x(), copy_rect.y(),
copy_rect.width(), copy_rect.height(),
GL_BGRA, GL_UNSIGNED_BYTE,
copy_bitmap.getAddr32(0, 0));
DCHECK(glGetError() == GL_NO_ERROR);
/* Enable if you're having problems with TexSubImage failing.
int err = glGetError();
DCHECK(err == GL_NO_ERROR) << "Error " << err <<
" copying (" << copy_rect.x() << "," << copy_rect.y() <<
")," << copy_rect.width() << "x" << copy_rect.height() <<
" for bitmap " << texture_size_.width() << "x" <<
texture_size_.height() <<
" real size " << existing_width << "x" << existing_height <<
" for " << this;
*/
}
}
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